:root {
    --energy-blue: #246beb;
    --energy-blue-deep: #1748af;
    --energy-mint: #4fd1a1;
    --energy-navy: #0f172b;
    --energy-navy-soft: #162039;
    --energy-line: #d9e3f0;
    --energy-bg: #f5f8fc;
    --energy-text: #6b7684;
    --energy-shadow: 0 24px 60px rgba(16, 38, 78, 0.12);
}

body.energy-page {
    background: var(--energy-bg);
    overflow-x: hidden;
}

.energy-home-btn {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 1200;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 88px;
    height: 48px;
    padding: 0 20px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid rgba(255, 255, 255, 0.7);
    box-shadow: 0 14px 34px rgba(15, 35, 61, 0.12);
    backdrop-filter: blur(14px);
    color: #1b2947;
    font-size: 16px;
    font-weight: 700;
}

.energy-grid {
    max-width: 1428px;
    width: 100%;
    margin: 0 auto;
}

.eng-tit {
    font-size: 20px;
    color: var(--energy-blue);
    font-weight: 600;
}

.section-tit {
    margin-top: 10px;
    font-size: 54px;
    line-height: 1.18;
    font-weight: 700;
    letter-spacing: -0.04em;
    word-break: keep-all;
    color: #1e2127;
}

.section-tit.light {
    color: #fff;
}

.section-desc,
.section-side-copy,
.reference-bottom-copy {
    font-size: 18px;
    line-height: 1.9;
    color: var(--energy-text);
    word-break: keep-all;
}

.center-head {
    text-align: center;
}

.section-head.split {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    align-items: end;
}

.section-head.split > * {
    flex: 1;
}

.hero-badge,
.hero-pill-wrap span,
.goal-cap,
.panel-label,
.tool-row span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
}

.energy-hero {
    position: relative;
    padding: 56px 0 150px;
    overflow: hidden;
    background:
        radial-gradient(circle at 16% 22%, rgba(36, 107, 235, 0.16), transparent 24%),
        radial-gradient(circle at 80% 18%, rgba(79, 209, 161, 0.16), transparent 20%),
        linear-gradient(180deg, #eff4ff 0%, #f5f8fc 60%, #f5f8fc 100%);
}

.energy-hero::after {
    content: "";
    position: absolute;
    inset: auto -10% 0 auto;
    width: 520px;
    height: 520px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(36, 107, 235, 0.1) 0%, rgba(36, 107, 235, 0) 68%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 0.92fr 1.08fr;
    gap: 56px;
    align-items: center;
}

.hero-copy {
    max-width: 560px;
}

.hero-badge {
    padding: 12px 20px;
    background: linear-gradient(135deg, #205bd8 0%, #123f9c 100%);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
}

.hero-kicker {
    margin-top: 28px;
    font-size: 24px;
    font-weight: 600;
    background: linear-gradient(90deg, #101318 0%, #2f66b9 100%);
    color: transparent;
    -webkit-background-clip: text;
    display: inline-block;
}

.hero-copy h1 {
    margin-top: 18px;
    font-size: 72px;
    line-height: 1.06;
    letter-spacing: -0.05em;
    font-weight: 700;
    color: #171a22;
    word-break: keep-all;
}

.hero-desc {
    margin-top: 28px;
    font-size: 19px;
    line-height: 1.9;
    color: var(--energy-text);
    word-break: keep-all;
}

.hero-pill-wrap {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 36px;
}

.hero-pill-wrap span {
    padding: 10px 18px;
    border: 1px solid rgba(36, 107, 235, 0.12);
    background: rgba(255, 255, 255, 0.75);
    box-shadow: 0 10px 30px rgba(27, 57, 110, 0.06);
    color: #2b3d5f;
    font-size: 15px;
    font-weight: 600;
}

.hero-visual {
    position: relative;
    min-height: 720px;
}

.hero-card {
    position: absolute;
    overflow: hidden;
    border-radius: 34px;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid rgba(255, 255, 255, 0.9);
    box-shadow: var(--energy-shadow);
}

.hero-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-main {
    top: 0;
    right: 0;
    width: 76%;
    height: 560px;
}

.hero-sub {
    left: 0;
    bottom: 0;
    width: 52%;
    height: 390px;
}

.floating-note {
    position: absolute;
    padding: 18px 22px;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.82);
    border: 1px solid rgba(255, 255, 255, 0.82);
    box-shadow: 0 18px 40px rgba(15, 35, 61, 0.12);
    backdrop-filter: blur(18px);
}

.floating-note strong {
    display: block;
    color: #1e2430;
    font-size: 18px;
    font-weight: 700;
}

.floating-note span {
    display: block;
    margin-top: 4px;
    color: var(--energy-text);
    font-size: 15px;
}

.note-a {
    left: 12%;
    top: 8%;
}

.note-b {
    right: 5%;
    bottom: 12%;
}

.energy-overview {
    padding: 60px 0 140px;
}

.overview-grid {
    display: grid;
    grid-template-columns: 0.92fr 1.08fr;
    gap: 48px;
    align-items: start;
}

.overview-side {
    display: grid;
    gap: 24px;
}

.info-panel,
.index-panel,
.problem-card,
.method-card,
.prediction-card,
.model-info-card,
.reference-card,
.effect-card {
    background: #fff;
    border-radius: 28px;
    box-shadow: 0 18px 46px rgba(16, 38, 78, 0.08);
}

.info-panel,
.index-panel {
    padding: 32px;
}

.info-panel dl {
    display: flex;
    align-items: start;
    gap: 18px;
    margin-bottom: 24px;
}

.info-panel dl:last-child {
    margin-bottom: 0;
}

.info-panel dt {
    min-width: 92px;
    font-size: 18px;
    font-weight: 700;
    color: #1d2230;
}

.info-panel dd {
    font-size: 18px;
    line-height: 1.7;
    color: var(--energy-text);
    word-break: keep-all;
}

.tool-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tool-row span {
    padding: 8px 14px;
    background: #f2f6fb;
    color: #2f4266;
    font-size: 15px;
    font-weight: 600;
}

.panel-tit {
    font-size: 18px;
    font-weight: 700;
    color: #1d2230;
}

.index-panel ul {
    margin-top: 20px;
    display: grid;
    gap: 14px;
}

.index-panel a {
    color: #4f5f74;
    font-size: 17px;
    font-weight: 500;
    transition: color .2s ease;
}

.index-panel a:hover {
    color: var(--energy-blue);
}

.energy-goal {
    padding: 140px 0;
    background:
        radial-gradient(circle at 50% 40%, rgba(76, 136, 255, 0.16), transparent 32%),
        linear-gradient(180deg, #121827 0%, #171d2e 100%);
}

.goal-card-wrap {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
    margin-top: 72px;
}

.goal-card-wrap li {
    padding: 34px 28px;
    border-radius: 28px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(14px);
}

.goal-cap {
    padding: 12px 22px;
    background: linear-gradient(135deg, #2c70ee 0%, #5f97ff 100%);
    color: #fff;
    font-size: 17px;
    font-weight: 700;
}

.goal-card-wrap p {
    margin-top: 26px;
    color: rgba(255, 255, 255, 0.74);
    font-size: 18px;
    line-height: 1.8;
    word-break: keep-all;
}

.energy-problem-sec,
.energy-method-sec,
.energy-model-sec,
.energy-reference-sec,
.energy-effect-sec {
    padding: 150px 0;
}

.problem-layout {
    display: grid;
    grid-template-columns: 0.86fr 1.14fr;
    gap: 28px;
    margin-top: 56px;
    align-items: stretch;
}

.problem-copy-wrap {
    display: grid;
    gap: 18px;
}

.problem-card,
.method-card,
.model-info-card,
.reference-card,
.effect-card {
    padding: 30px;
}

.problem-card strong,
.method-card strong,
.model-info-card strong,
.reference-card strong,
.effect-card strong,
.concept-copy strong {
    display: block;
    color: #1e2430;
    font-size: 28px;
    font-weight: 700;
    line-height: 1.3;
    word-break: keep-all;
}

.problem-card p,
.method-card p,
.model-info-card p,
.reference-card p,
.effect-card p,
.concept-copy p {
    margin-top: 14px;
    color: var(--energy-text);
    font-size: 18px;
    line-height: 1.8;
    word-break: keep-all;
}

.problem-visual-wrap {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.problem-shot,
.concept-main-shot,
.model-shot,
.reference-shot {
    overflow: hidden;
    border-radius: 30px;
    background: #fff;
    box-shadow: var(--energy-shadow);
}

.problem-shot img,
.concept-main-shot img,
.model-shot img,
.reference-shot img,
.prediction-image img {
    width: 100%;
    height: 100%;
    display: block;
}

.problem-shot.large {
    grid-column: span 2;
    min-height: 320px;
}

.problem-shot img {
    object-fit: cover;
}

.method-layout {
    display: grid;
    grid-template-columns: 0.94fr 1.06fr;
    gap: 28px;
    margin-top: 56px;
    align-items: start;
}

.method-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.prediction-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
    padding: 22px;
    align-items: center;
}

.prediction-image {
    max-width: 280px;
    width: 100%;
    border-radius: 24px;
    overflow: hidden;
    background: #f5f8fc;
    margin: 0 auto;
}

.prediction-image img {
    object-fit: contain;
}

.prediction-copy {
    padding: 6px 6px 6px 0;
}

.panel-label {
    padding: 9px 16px;
    background: #edf4ff;
    color: var(--energy-blue);
    font-size: 14px;
    font-weight: 700;
}

.prediction-copy span {
    display: block;
    margin-top: 18px;
    color: var(--energy-text);
    font-size: 18px;
    line-height: 1.8;
    word-break: keep-all;
}

.energy-concept-sec {
    padding: 150px 0;
    background:
        radial-gradient(circle at 50% 0%, rgba(83, 156, 248, 0.2), transparent 36%),
        linear-gradient(180deg, #1a4fb8 0%, #12409f 100%);
}

.concept-stage {
    display: grid;
    grid-template-columns: 1.04fr 0.96fr;
    gap: 30px;
    margin-top: 72px;
    align-items: center;
}

.concept-main-shot {
    padding: 16px;
}

.concept-main-shot img {
    object-fit: cover;
    border-radius: 22px;
}

.concept-copy {
    padding: 34px;
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(16px);
}

.concept-copy strong,
.concept-copy p {
    color: #fff;
}

.concept-copy p {
    color: rgba(255, 255, 255, 0.78);
}

.energy-model-sec {
    background: #fff;
}

.model-grid {
    display: grid;
    grid-template-columns: 0.92fr 1.08fr;
    gap: 40px;
    align-items: center;
}

.model-info-wrap {
    display: grid;
    gap: 18px;
    margin-top: 32px;
}

.model-shot {
    padding: 16px;
}

.model-shot img {
    object-fit: contain;
    border-radius: 24px;
    background: #f4f7fb;
}

.reference-grid {
    display: grid;
    grid-template-columns: 0.88fr 1.12fr;
    gap: 28px;
    margin-top: 56px;
}

.reference-strip {
    display: grid;
    gap: 16px;
}

.reference-shot {
    padding: 12px;
}

.reference-shot img {
    border-radius: 20px;
    object-fit: cover;
}

.reference-copy {
    display: grid;
    gap: 22px;
}

.reference-pair {
    display: grid;
    grid-template-columns: 0.72fr 1.28fr;
    gap: 18px;
}

.reference-shot.compact {
    min-height: 220px;
}

.energy-effect-sec {
    padding-bottom: 220px;
}

.effect-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 72px;
}

.energy-pdf-action {
    display: flex;
    justify-content: center;
    margin-top: 56px;
}

.energy-pdf-btn {
    min-width: 280px;
    padding: 18px 34px;
    border-radius: 999px;
    background: linear-gradient(135deg, #205bd8 0%, #123f9c 100%);
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    box-shadow: 0 18px 44px rgba(16, 56, 138, 0.22);
    transition: transform .2s ease, box-shadow .2s ease;
}

.energy-pdf-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 22px 48px rgba(16, 56, 138, 0.28);
}

.energy-pdf-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: none;
}

.energy-pdf-modal.open {
    display: block;
}

.energy-pdf-bg {
    position: absolute;
    inset: 0;
    background: rgba(7, 14, 28, 0.64);
    backdrop-filter: blur(8px);
}

.energy-pdf-dialog {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(1120px, calc(100% - 48px));
    height: min(84vh, 920px);
    border-radius: 30px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 24px 70px rgba(8, 20, 44, 0.28);
}

.energy-pdf-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 22px 28px;
    border-bottom: 1px solid #e8eef6;
}

.energy-pdf-head strong {
    color: #182033;
    font-size: 22px;
    font-weight: 700;
}

.energy-pdf-close {
    padding: 10px 18px;
    border-radius: 999px;
    background: #eff4fb;
    color: #36507a;
    font-size: 15px;
    font-weight: 700;
}

.energy-pdf-body {
    height: calc(100% - 83px);
    background: #eef3f9;
}

.energy-pdf-body object,
.energy-pdf-body iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

@media (max-width: 1280px) {
    .hero-grid,
    .overview-grid,
    .problem-layout,
    .method-layout,
    .concept-stage,
    .model-grid,
    .reference-grid,
    .section-head.split {
        grid-template-columns: 1fr;
    }

    .goal-card-wrap,
    .effect-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-visual {
        min-height: 620px;
    }

    .hero-copy h1,
    .section-tit {
        font-size: 56px;
    }

    .prediction-card {
        grid-template-columns: 240px 1fr;
    }

    .prediction-image {
        max-width: 240px;
    }
}

@media (max-width: 767px) {
    .energy-hero,
    .energy-overview,
    .energy-goal,
    .energy-problem-sec,
    .energy-method-sec,
    .energy-concept-sec,
    .energy-model-sec,
    .energy-reference-sec,
    .energy-effect-sec {
        padding: 110px 20px;
    }

    .hero-copy h1,
    .section-tit {
        font-size: 38px;
    }

    .hero-desc,
    .section-desc,
    .section-side-copy,
    .problem-card p,
    .method-card p,
    .model-info-card p,
    .reference-card p,
    .effect-card p,
    .concept-copy p,
    .prediction-copy span,
    .reference-bottom-copy {
        font-size: 16px;
    }

    .hero-visual {
        min-height: 420px;
    }

    .hero-main {
        width: 82%;
        height: 300px;
    }

    .hero-sub {
        width: 58%;
        height: 210px;
    }

    .floating-note {
        display: none;
    }

    .goal-card-wrap,
    .method-grid,
    .problem-visual-wrap,
    .reference-pair,
    .effect-grid {
        grid-template-columns: 1fr;
    }

    .prediction-card {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .prediction-image {
        max-width: 220px;
    }

    .problem-shot.large {
        grid-column: auto;
    }

    .info-panel,
    .index-panel,
    .problem-card,
    .method-card,
    .prediction-card,
    .model-info-card,
    .reference-card,
    .effect-card,
    .concept-copy {
        padding: 24px;
        border-radius: 24px;
    }

    .problem-card strong,
    .method-card strong,
    .model-info-card strong,
    .reference-card strong,
    .effect-card strong,
    .concept-copy strong {
        font-size: 24px;
    }

    .energy-pdf-dialog {
        width: calc(100% - 24px);
        height: min(80vh, 760px);
        border-radius: 24px;
    }

    .energy-home-btn {
        top: 16px;
        right: 16px;
        min-width: 76px;
        height: 42px;
        padding: 0 16px;
        font-size: 15px;
    }

    .energy-pdf-head {
        padding: 18px 20px;
    }

    .energy-pdf-head strong {
        font-size: 18px;
    }

    .energy-pdf-btn {
        min-width: 100%;
        font-size: 16px;
    }
}